Abstract
Abstract The relation between (a) length of the recall period and (b) validity and quality of data on the use of time is examined. All of the data are based on 24-hour diary constructions or reconstructions. We find that recall periods of one day are essentially equivalent, in terms of validity and quality, to recall periods of up to one week for time diaries of Fridays, Saturdays, or Sundays, but that one-day recall is significantly better than more extended recall for Monday—Thursday diaries. These findings suggest that a sample design using randomly designated rather than convenient diary dates would be of acceptable quality in the United States. We also find that technical change in telephone interviewing techniques significantly improves the quality of current data over data collected in the mid-1970s, and that longitudinal panel data have significantly higher quality than cross-sectional data.
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